{"title":"Coolant Bypass Kits","description":"\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eEqualize core engine operating temperatures, eliminate dangerous rear-cylinder thermal hot spots, and maintain optimal fluid circulation velocity through blocked water jackets by routing high-flow coolant lines directly from your engine block's back cylinders to the primary radiator thermostat housing with heavy-duty thermal regulation lines engineered to deliver consistent cooling performance under high-load tracking conditions, eliminate catastrophic head gasket blowouts, cracked cylinder head castings, and frustrating overheating wear loops caused by unoptimized factory cooling paths dead-ending at the rear of the block, low-grade plastic bypass plugs fracturing from intense engine heat-soak, or trapped air pockets boiling away vital engine fluid barriers during extreme towing operations, heavy-duty commercial hauling, track racing, or rugged off-road overland expeditions, and secure your primary powertrain thermal safety architecture with our professional-grade selection in the \u003c\/span\u003e\u003cb data-path-to-node=\"7\" data-index-in-node=\"997\"\u003eCoolant Bypass Kits\u003c\/b\u003e\u003cspan\u003e collection. At DIY Customs, we provide premium stainless steel braided coolant bypass lines, high-flow billet aluminum adapter blocks, thermal-wrapped pressure hoses, and heavy-duty silicone engine cooling links engineered to deliver a seamless and perfect fit across your specific high-performance diesel or gas engine block layout. Whether you are packaging a high-strength, low-restriction thermal management layout to interface safely near primary turbocharger downpipes, exhaust gas recirculation (EGR) modules, and dual-battery power banks on a rugged off-road overland truck or commercial service vehicle, outfitting your custom shop garage workspace configuration with reliable cooling system upgrades to upgrade fleet maintenance service bays, specialized diesel repair garages, and custom fabrication hubs, or conducting final pressure-test system diagnostics tracking on your shop floor, our industrial-grade cooling hardware ensures maximum heat dissipation metrics and mechanical safety parameters. From heavy-duty anodized aluminum fittings pre-machined to accept premium temperature sending units to robust, multi-layer silicone construction built to handle extreme cooling system pressures and vibration cycles, we carry the ultimate mechanical tracking and asset preservation essentials—and if you don't see your specific engine model requirements, exact fitting thread dimensions, or specialized manufacturer cooling lines, you can hit the live chat or call \u003c\/span\u003e\u003cb data-path-to-node=\"7\" data-index-in-node=\"2493\"\u003e412-882-8346\u003c\/b\u003e\u003cspan\u003efor direct special ordering and drop-shipping straight to your doorstep!\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"fleece-performance-13-16-dodge-6-7l-cummins-coolant-tank-assembly","title":"Fleece Performance 13-16 Dodge 6.7L Cummins Coolant Tank Assembly","description":"\u003cp\u003eFleece Performance 13-16 Dodge 6.7L Cummins Coolant Tank Assembly\u003c\/p\u003e","brand":"Fleece Performance","offers":[{"title":"Default Title","offer_id":45241168986364,"sku":"FPE-34235","price":453.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0641\/6518\/3740\/products\/6a4f392f2b521852193355aaad9102f8.jpg?v=1710862488"},{"product_id":"fleece-performance-07-5-12-dodge-ram-2500-3500-6-7l-cummins-coolant-bypass-kit","title":"Fleece Performance 07.5-12 Dodge\/RAM 2500\/3500 6.7L Cummins Coolant Bypass Kit","description":"\u003cp\u003eFleece Performance 07.5-12 Dodge\/RAM 2500\/3500 6.7L Cummins Coolant Bypass Kit\u003c\/p\u003e","brand":"Fleece Performance","offers":[{"title":"Default Title","offer_id":45250724430076,"sku":"FPE-CLNTBYPS-CUMMINS-0712","price":465.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0641\/6518\/3740\/files\/1ae7c7853f9f3b354668b0199ebe5632.png?v=1711073019"},{"product_id":"fleece-performance-13-18-ram-2500-3500-6-7l-cummins-coolant-bypass-kit","title":"Fleece Performance 13-18 RAM 2500\/3500 6.7L Cummins Coolant Bypass Kit","description":"\u003cp\u003eFleece Performance 13-18 RAM 2500\/3500 6.7L Cummins Coolant Bypass Kit\u003c\/p\u003e","brand":"Fleece Performance","offers":[{"title":"Default Title","offer_id":45250724495612,"sku":"FPE-CLNTBYPS-CUMMINS-1318","price":443.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0641\/6518\/3740\/files\/1e6788356d7a2cce9e1dcdebbd67de8c.png?v=1711073024"},{"product_id":"fleece-performance-98-5-07-dodge-2500-3500-cummins-replacement-thermostat-housing-w-aux-port","title":"Fleece Performance 98.5-07 Dodge 2500\/3500 Cummins Replacement Thermostat Housing w\/Aux Port","description":"\u003cp\u003eFleece Performance 98.5-07 Dodge 2500\/3500 Cummins Replacement Thermostat Housing w\/Aux Port\u003c\/p\u003e","brand":"Fleece Performance","offers":[{"title":"Default Title","offer_id":45250724561148,"sku":"FPE-CUMM-TH-1318","price":196.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0641\/6518\/3740\/files\/26ca19545e45d2fef0d040196fdfba92.png?v=1711073029"},{"product_id":"fleece-performance-19-22-ram-2500-3500-cummins-6-7l-replacement-thermostat-housing-w-aux-port","title":"Fleece Performance 19-22 RAM 2500\/3500 Cummins 6.7L Replacement Thermostat Housing w\/Aux Port","description":"\u003cp\u003eFleece Performance 19-22 RAM 2500\/3500 Cummins 6.7L Replacement Thermostat Housing w\/Aux Port\u003c\/p\u003e","brand":"Fleece Performance","offers":[{"title":"Default Title","offer_id":45250724659452,"sku":"FPE-CUMM-TH-19","price":196.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0641\/6518\/3740\/files\/d87b2b3fb0d604f45d94e1ef958fa3b0.png?v=1711073035"},{"product_id":"fleece-performance-07-5-18-dodge-ram-2500-3500-cummins-replacement-coolant-bypass-hose","title":"Fleece Performance 07.5-18 Dodge\/RAM 2500\/3500 Cummins Replacement Coolant Bypass Hose","description":"\u003cp\u003eFleece Performance 07.5-18 Dodge\/RAM 2500\/3500 Cummins Replacement Coolant Bypass Hose\u003c\/p\u003e","brand":"Fleece Performance","offers":[{"title":"Default Title","offer_id":45250724724988,"sku":"FPE-CLNTBYPS-HS-0718","price":147.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0641\/6518\/3740\/files\/7cabe0ad97bee068ff4ebb2367da1940.png?v=1711073040"},{"product_id":"fleece-performance-universal-pre-formed-5-8in-id-hose-w-90-deg-ends-t-fitting","title":"Fleece Performance Universal Pre-Formed 5\/8in ID Hose w\/ 90 Deg. 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This can cause excessive pressure to build in the system, especially the rear of the block and possibly blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure. We?ve designed our coolant bypass kit with a secondary thermostat, that unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders. Our kit comes with high quality AN o-ring fittings and AN hose connections with braided hose to ensure a leak free installation.\u003c\/p\u003e","brand":"Fleece Performance","offers":[{"title":"Default Title","offer_id":45518231634172,"sku":"FPE-CLNTBYPS-CUMMINS-0607","price":442.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0641\/6518\/3740\/files\/16269515c86d8df0c2802eddc2d72344.jpg?v=1713334395"},{"product_id":"fleece-performance-94-98-dodge-5-9l-cummins-12v-coolant-bypass-kit","title":"Fleece Performance 94-98 Dodge 5.9L Cummins 12V Coolant Bypass Kit","description":"\u003cp\u003eAnother product from Fleece Performance built out of necessity is the 1998.5-2002 Cummins Coolant Bypass kit. The Cummins engine cooling system was designed to adequately cool a 300-350hp engine. When the horsepower is increased there is an increased demand on the cooling system. 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